[Extremely delayed mineralisation of a first premolar in conjunction with submerged deciduous molars--a case report].

This case report presents a patient with extremely delayed mineralisation of a first upper right premolar and simultaneously congenitally missing second premolars. While the germs of the first premolars are usually detectable on dental X-ray films at the age of three or four years, the demonstrated patient was older than 13 years when the first premolar became visible. As the right first bicuspid actively erupted normal root growth took place, and once the tooth is in its normal position its anatomy can be considered normal. With the eruption of the permanent tooth the periodontal situation improved considerably in the region where depression of its predecessor had taken place. As a practical clinical consequence one should take into consideration that mineralisation of a first premolar can be extremely delayed in cases with congenitally missing second premolar teeth.